- Father of King Willem-Alexander, Johan Friso (b. September 25th 1968) and Prins Constantijn. Son-in-law son of Queen Juliana and Prince Bernhard of the Netherlands. Father-in-law of Queen Máxima of the Netherlands.
- Son of Claus von Amsberg (1890-1953) and Gosta (1902-1996).
- Grandfather of Catharina-Amalia (b. 2003), Alexia Juliana (b. 2005), Ariana Wilhelmina (b. 2007), Emma Luana (b. 2005), Joanna Zaria (b. 2006), Eloise (b. 2002), Claus-Casimir (b. 2004) and Leonore Marie (b. 2006).
- Has six sisters.
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